Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bee9c4a3db25a93…

MALICIOUS

PDF

85.6 KB Created: 2021-03-18 17:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 124c334d4e4ddca6940dd87c0c7d4819 SHA-1: a377de74d4d3bb26ac8c8701a67465a47bac4167 SHA-256: 4bee9c4a3db25a93e32a8bed81df1bae363008004ea5ebb94451e66bdade3b62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and potentially malicious content, indicating a link farm or phishing lure. The presence of external URIs and the ML classification strongly suggest an intent to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=alfred+rosenberg+livros+pdf PDF link annotation
    • http://opt05.ru/tineziranu8z8.pdfIn PDF document text
    • http://creditscoretracking.info/covid_19_risk_assessment_template_south_africam998l.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/nutufutudopuraze.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hjhjijD/xison.pdfIn PDF document text
    • http://wewifodajukovu.iblogger.org/how_to_use_the_universal_waite_tarot_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/dowivita/Lq9gcic/mobile_device_helper_parou_de_funcionar.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/FzhdezM/44942894362.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/94ed31d8dc.pdfIn PDF document text
    • https://watuluvijigu.weebly.com/uploads/1/3/3/9/133997483/8507688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/567bca84-89f2-4aab-9cbb-a09860b3884d/how_to_use_a_square_tube_bender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f5a35e-df37-4275-9e1f-739ed751bf1f/31290326014.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_2367b24915fc4e90b9ffb0b11f8052ea.pdf?index=trueIn PDF document text
    • http://webekilijonelew.epizy.com/suzefufepija.pdfIn PDF document text
    • http://kutezusozajejeg.epizy.com/69548292871.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_9a3b082fc0e140dd85b05c420ed12fdd.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_3ed77cb218dc46ec91b5eecd3fd6a99c.pdf?index=trueIn PDF document text
    • http://movozenumoz.epizy.com/vakexoxusumefepejedirox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb0fac2-a7be-4f2f-b03e-9a8f704b1c92/cat_in_the_hat_costume_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3f35e0-b165-4083-b880-220b60f73433/are_whirlpool_french_door_refrigerators_good.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 5188 bytes
SHA-256: b60dfd61e5138a099b7f7265dcb7a962355b6aed6050a2d3d0aa1551acce6dde
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 14128 bytes
SHA-256: 624206d3c0ebaa2d26d82560a3a1fd7b20472cb70ebd08234dd7a783d118e0a8
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 17692 bytes
SHA-256: 64fa07833d01ee4977b7875c3b077d7e89e2878b9bbee5887931215fea6e30f8

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